Had recently run a poll on whether users of the facebook page Dojo Mats did any exercise outside of Judo. 68 People had participated in the poll.
Out of the 68, 35 of the participants voted that they engage in heavy weights at the gym.
It is interesting to note that half of the participants lift weights and lead a fairly active lifestyle, with Judo included!
Out of the 68, 87% of the participants voted that they are active outside of Judo, and engage in some form of exercise. This means that it safe to conclude that if you start Judo, you will likely start another form of exercise outside Judo, to either supplement it, or to continue the active lifestyle
This small poll produced fairly interesting results and I would be keen to set up an online competition involving weights for Judoka worldwide.